XML 150 R131.htm IDEA: XBRL DOCUMENT v3.21.1
Borrowings - Summary of Long-term Notes Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure Of Long Term Notes Payable [Line Items]      
Bonds issued $ 56,253,554 $ 2,003,332 $ 36,522,155
Less: current portion     94,798
Bonds payable $ 49,253,603 $ 1,754,046 36,272,155
Unamortized Discounts [member]      
Disclosure Of Long Term Notes Payable [Line Items]      
Less: unamortized discounts     2,137
Bonds issued     97,879
Bonds payable     3,081
Commercial Papers [Member]      
Disclosure Of Long Term Notes Payable [Line Items]      
Bonds payable     $ 100,016
Long Term Notes Payable [Member] | Bottom of range [member]      
Disclosure Of Long Term Notes Payable [Line Items]      
Annual interest rates     5.02%
Long Term Notes Payable [Member] | Top of range [member]      
Disclosure Of Long Term Notes Payable [Line Items]      
Annual interest rates     6.89%